Patent GB-191413023-A (GB)
Title: Improvements in Machines for Bending Wire.
IPC: B21F35/04
Filed: 1914-05-27
Granted: 1915-05-27
Abstract: 13,023. Spirella Co., [Spirella Co.]. May 27. Making metal fabrics; angular bending; winding and reeling.-In a machine for bending wire into sinuous form for making a flat wire spring, particularly for corset stays, of the type in which an oscillatory bending and guiding arm bends the wire round alternately raised and lowered pins, the bending-arm is oscillated through an arc on the opposite side of the pins to the direction of the feed of the finished fabric. A pair of blocks 2 each provided with a pair of pins 1 are fixed in the split ends of a pair of levers 5, 5<a>, pivoted at 13, 13<a>, Fig. 6, and alternately raised and lowered into the plane of the fabric by a pair of 'cams 8<a> carried by the driving shaft. The pivots are carried eccen. trically on a pair of spindles 7, 7<a>, mounted at different levels, and so arranged that the pivots are normally in alinement. An arm 14 rigidly secured to the pivot 13 carries a bolt 18 engaging a slot in an arm 15 secured to the pivot 13<a> so that when the spindle 7 is oscillated the levers will move horizontally in opposite directions. The levers are moved rearwardly when in their raised positions so as to effect the feed of the wire. The spindle 7 is oscillated by a cam on the shaft 9 through a yoke 22 connected to a lever 25 on the spindle 7 by a screwed rod 22<a>. The levers mav be adjusted relatively to each other so as to locate the pins I correctly by adjusting the block 24<a> connected to the pivot of the lever 25 on the screwed rod 22a. The bending-arm 30, which is grooved to receive the wire and has a conical hardened steel nose 75, is secured to a shaft 31 in the central longitudinal plane of the machine and is axially adjustable thereon. This shaft is carried in bearings 32 on a standard 35 which is adjustable about a sleeve 46 mounted on a pivot 45<a> to vary the inclination of the shaft so as to vary the inclination of the loops to the plane of the stay. In order to provide for an axial adjustment of the shaft, the sleeve is eccentrically mounted on the pivot 45<a>, and is rotated thereon and then fixed in its adjusted position by a screw engaging one of a number of holes 51 in the framing. The shaft 31 is oscillated by a bevel pinion 36 engaging a rack 37 which is carried bv an arm mounted on the shaft 38 carried by the standard 35. This shaft 38 is operated from the main shaft 9, Fig. 2, by a crank 41 through a link 40 and arm 39, the amplitude of the oscillations being varied by mounting the connecting bolt 43 in a slot 41<a> in the crank. The angular position of the bending arm 30 on its shaft is varied by connecting the arm 39 to the shaft 38 by means of a split sleeve 44 and clamping bolt 45, a washer 46<a> secured to the shaft bv a screw 47<a> keeping the arm 39 on the shaft during adjustment. The variation of the amplitude of the oscillations and of the angular position of the bending arm, together with a new set of pin blocks having a different arrangement of the pins is for the purpose of varying the overlap of the loops or to obtain an unsymmetrical stay or a flat stay. The wire is fed from a spool through a tension device, a tube 74 secured to the gear wheel 36 and thence to the arm 30. The wire may be tensioned by a pivoted member 85, Fig. 1, secured in a slot in the shaft 31 and pressed by a spring 83 towards an inclined wall in a tube 80 secured to the shaft or in a block 89<a> secured in the tube. The tension is adjusted by a screw 84. To facilitate the insertion of the wire, the lever 85 may be provided with a finger 90. In order that the tension may be automatically decreased during the feeding of the wire and inereased during the actual bending operation the lever 85, Fig. 11, may be acted upon either in addition to or in place of the spring 83 by a pin 101 engaged by a lever 103 running in a slotted cam 105 secured to the standard. The tension may also be adjusted by pivoting the bending-arm in the split sleeve 70, Fig. 8, which is secured to the shaft and controlling its movement by a cam 99 on the frame. The fabric is pressed down on the pin-carriers by a foot-piece 55 carried by an arm 58 and controlled by a lever 60 connected to a rod 61, the pressure being regulated by a spring 64 secured to an adjustable screw 65 or by a rod, the lever and arm being in most cases sufficiently resilient. The foot is raised out of contact with the work when the machine is not running by a wing-nut 63 screwed on the rod 61. The first loop is formed by hand, a hand-wheel being mounted on the driving-pulley to rotate the shaft 9.